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Finding the Fourth Proportional to 13,710.72, 18,921.60 and 9,235.20

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Solution

The fourth proportional to 13,710.72, 18,921.60 and 9,235.20 is: 12,745.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,710.72 : 18,921.60 = 9,235.20 : x
  2. Step 2: Convert to fraction form
    13,710.72/18,921.60 = 9,235.20/x
  3. Step 3: Cross multiply
    13,710.72x = 18,921.60 × 9,235.20
  4. Step 4: Simplify right side
    13,710.72x = 174,744,760.32
  5. Step 5: Solve for x
    x = 174,744,760.32/13,710.72
  6. Step 6: Final answer
    x = 12,745.12

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.